Metal-heating furnace



W; HARTY.

METAL HEATING FURNAGB.

Patented May 5,21885.

PEIERS. Pmm-Lnnampw. wam-wm n. c.

(No Model.)

v1\To.316,963.`

UNITED STATES Y PATENT EETCE.

WILLIAM HARTY, OF PORTSMOUTH, OHIO.

METAL-HEATING FU RNVACE.

SFECEFCATION forming part of Letters Patent No. 316,963, dated May 5, 1885.

Application filed September 18, 1882. (No model.)

.To all whom it may concern:

Be it known that I, VILLIAM HARTY, of Portsmouth, in the county of Scioto and State of Ohio, have invented certain new and useful Improvements in Heating Furnaces, of which the following is a specification.

Myinvention relates to that class of furnaces which are employed for heating iron or steel preparatory to forming it into various shapes or tempering, and is especially adapted to the manufacture of steel springs, the bars of steel being placed in the furnace and heated preparatory to forming and tempering.

rlhe object of my invention is to produce a furnace by the employment of which the greatest amount of heat may be obtained from a given quantity of fuel,and whereby the stock in the furnace is heated to an even degree throughout, thus insuring an even temper in all parts of the spring.

Referring to the drawings forming part of this specification, Figure 1 represents a central longitudinal section through the furnace. Fig. 2 is a horizontal section taken at the line :v w of Fig. 1. Fig. 3 is a vertical transverse section taken at the line y y of Fig. 1.

Z represents the fr0nt,aud Z the rear,of the furnace. y

A is the fire or fuel chamber, which is located at the rear of the furnace, the door a of which may be located in the rear. Wall, or, preferably, as shown in the drawings, in the side wall, the grate-bars running at right angles to the length of the furnace. Below the fire-chamber is the usual ash-pit,A'. ln front of the nre-chamber A is the heating-chamber B, in which the stock to be heated is placed. Both the roof and the floor of this heatingchamber slant toward the front, as shown in Fig. 1, to concentrate'the heat in the heatingchamber as the distance from the fire increases; and the front opening is closed by a door, b, either hinged, or, preferably', as shown in the drawings, capable of sliding up and down, to open or close the entrance to the heating-furnace. Vhen made to slide, a cord or chain is usually attached to the upper edge of the door, which, after passing over a pulley at the top of the furnace, passes down and is attached to a foot-lever by pressing down which the door is raised, and both hands of the operator are free to manipulate the stock.

Between the fire-chamber A and heatingchamber B is a bridge-wall, O, between the top of which aud the roof of the furnace a space or throat is left the height of which is governed by the size of the furnace. On top of this bridge-wall is placed an apron, D, extending from side to side of the furnace and projecting into the heating-chamber B. The greatest amount of heat in the heating-chamber Bgis naturally nearest to the fire-chamber, and diminishes gradually toward the opposite end of the chamber, andthe purpose of the apron D is to equalize the heat throughout the chamber, which it does by governing the current of heated air and burning gases so that they will be equally distributed by directing them toward the front of the chamber, at which point the exit-fines are located, thus more perfectly compensating for the loss of heat consequent upon the distance of the front of the furnace away from the fire-chamber, and by this means the stock is heated evenly throughout. Were it not for this apron D the burning gases from the re-chamber, after passing over the bridge-wall,would dip down and strike the stock in the heating at a point near the bridge-wall, and consequently this end of the stock would be heated to a much higher degree than the opposite end,near the front of the chamber.

At either side of the `front of the furnace are the diving-dues c, which lead from the heating-chamber B into the main exit-flue E, located directly beneath the heating-chamber and extending from the front to the rear end of the furnace, at which latter point it opens into a tunnel, F, leading to a stack, as shown in Fig. 1, or directly into a stack, F', as shown in Fig. 2. .Where the tunnel F is used, the smoke from several furnaces may empty into it and be conducted to a common stack. This fiue E, being located directly under the heating-chamber B, compels all the products of combustion, after passing forward through the heating-chamber B, to pass backward under the door of said chamber, which door soon becomes very hot, thereby adding greatly to the heat in the heating-chamber, and any gases which are unconsumed in passing through the heating-chamber are thoroughly consumed in the flue E by coming in contact with the heated wall between the heating-chamber and ICO the flue. The inlet to the flue E through the iues e, located at either side of the chamber, being double, the burning gases and products of combustion are divided, leaving a comparatively free space behind the door to the heating-chamber, thus giving the operator a good chance t0 manipulate the stock being heated.

The furnace is built of fire-brick, and the upper part is preferably incased in metal plates G, which are held iirmly in position by bolts or rods g passing above and through the walls ofthe furnace. rlhe apron D also consists of a tile made of lire-clay, and is there- -fore very durable. Y

By the above construction, it will be seen, I am enabled to produce an even temperature throughout the heating-chamber, insuring a uniform heating of the stock, and also that I yutilize the greatest possible amount of heat from a given quantity of fuel.

Having thus described my invention, what I claim as new and of my invention, and desire to secure by Letters Patent, is as follows:

l. A heating-furnace having the re-chamber A and heating-chamber B separated by a bridge-wall, G, having an apron, D, the bottom of the heating-chamber being in combination with the single broad exit-Hue, E, 1ocated below the said chamber B and communicating with the heating-chamber by two downtakes or diving-flues, e, located near the charging-door and at the side of the heatingchamber, and formed at or in the sidewalls ot' the furnace, substantially as and for the purposes described.

2. A heating-furnace having the fire-charnber A and heating-chamber B separated by a bridge-wall, C, having an apron, D, the bottom of the heating-chamber being inclined upward toward the charging-door, in combination with the single broad exit-flue E, located below the said chamber B, and communicating with the heating-chamber by two downtakes or diving-lues, e, located near the charging-door and at the side of the heatingchamber, and formed at or in the side walls of the furnace, substantially as and for the purposes described.

8. A heating-furnace having the lire-charnber A and heating-chamber B separated bya bridge-wall, C, having an apron, D, the bottom of the heating-chamber being preferably inclined upward toward the charging-door, in combination with the single broad exitflue, E, located below the said chambers, and communicating with the heating-chamber by two downtakes or diving-fines, e, located near the charging-door and at the side of theheating-chamber, and formedat or in the side walls of the furnace, and tunnel F atrrear of said heating-furnace, and communicates with stack, substantially as and for the purposes described.

WVM. HARTY.

Attest:

JAMEs W'. HARTY, FRANK. PICKLE. 

